Comment 2 for bug 1573188

> Can you provide a snap that uses the missing functionality?

Sure: https://github.com/kyrofa/systray-example-snap . It's just Qt's systray example. Note that if you install it with --devmode and run `systray` it works (mostly-- the icon itself is broken, but I'm not sure that's Snappy's fault), but if you install it normally nothing appears to happen.